util/notify.c

   1 /*
   2  * Notifier lists
   3  *
   4  * Copyright IBM, Corp. 2010
   5  *
   6  * Authors:
   7  *  Anthony Liguori   <aliguori@us.ibm.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2.  See
  10  * the COPYING file in the top-level directory.
  11  *
  12  * Contributions after 2012-01-13 are licensed under the terms of the
  13  * GNU GPL, version 2 or (at your option) any later version.
  14  */
  15
  16 #include "qemu/osdep.h"
  17 #include "qemu/notify.h"
  18
  19 void notifier_list_init(NotifierList *list)
  20 {
  21     QLIST_INIT(&list->notifiers);
  22 }
  23
  24 void notifier_list_add(NotifierList *list, Notifier *notifier)
  25 {
  26     QLIST_INSERT_HEAD(&list->notifiers, notifier, node);
  27 }
  28
  29 void notifier_remove(Notifier *notifier)
  30 {
  31     QLIST_REMOVE(notifier, node);
  32 }
  33
  34 void notifier_list_notify(NotifierList *list, void *data)
  35 {
  36     Notifier *notifier, *next;
  37
  38     QLIST_FOREACH_SAFE(notifier, &list->notifiers, node, next) {
  39         notifier->notify(notifier, data);
  40     }
  41 }
  42
  43 bool notifier_list_empty(NotifierList *list)
  44 {
  45     return QLIST_EMPTY(&list->notifiers);
  46 }
  47
  48 void notifier_with_return_list_init(NotifierWithReturnList *list)
  49 {
  50     QLIST_INIT(&list->notifiers);
  51 }
  52
  53 void notifier_with_return_list_add(NotifierWithReturnList *list,
  54                                    NotifierWithReturn *notifier)
  55 {
  56     QLIST_INSERT_HEAD(&list->notifiers, notifier, node);
  57 }
  58
  59 void notifier_with_return_remove(NotifierWithReturn *notifier)
  60 {
  61     QLIST_REMOVE(notifier, node);
  62 }
  63
  64 int notifier_with_return_list_notify(NotifierWithReturnList *list, void *data,
  65                                      Error **errp)
  66 {
  67     NotifierWithReturn *notifier, *next;
  68     int ret = 0;
  69
  70     QLIST_FOREACH_SAFE(notifier, &list->notifiers, node, next) {
  71         ret = notifier->notify(notifier, data, errp);
  72         if (ret != 0) {
  73             break;
  74         }
  75     }
  76     return ret;
  77 }